a novel soft-switched quasi-resonant bidirectional dc/dc converter for electric vehicle application

In this paper, a novel high gain, non-isolated, coupled-inductor (cl) based, bidirectional dc/dc converter (clbdc) is presented. in step-up mode, the clbdc operates in quasi-resonance (qr) mode due to the leakage inductance (lk) of the cl. qr operation offers several advantages, such as soft-switching conditions of boost switch turn-on (zvs) and diodes turn-off (zcs), which significantly reduce switching losses and increase the converter’s efficiency. the clbdc benefits from a wide range of high voltage gain in both step-up and step-down modes due to the presence of the cl and boost capacitor. furthermore, the clbdc’s input current has a low ripple. these features make this converter useful for electric vehicle applications and two-way power flow. the operating principles and steady-state analysis are discussed for both boost and buck modes. to verify the clbdc feasibility, simulations are performed in simulink/matlab software. the simulation results prove the validity of the converter specifications well.